Air-admission means for boiler-furnaces.



J. c. MARTIN, IR AIR ADMISSION MEANS FOR BOILER FURNACES.

I APPLICATION FILED MAR. 22.19I9. I 1,321,537. Patented Nov. 11, 1919 1.c. MARTIN, In.

AIR ADMISSION MEANS FOR BOILER FURNACES.

APPLICATION FILED MAR. 22- I9l9.

' Patented Nov. 11, 1919.

2 SHE\ETSSHEET 2- res- JESSE C. MARTIN, JR., OF SAN FRANCISCO,CALIFORNIA.

AIR-ADMISSION MEANS FOR BOILER-FURNACES.

Specification ofiLetters Patent.

Patented Nov. 11, 1919.

Application filed March 22, 1919. Serial No. 284,424.

To all whom it may concern:

Be it known that 1, Jesse C. MARTIN, Jr.. a citizen of the lnitedStates, and a resident of San Francisco, county of San Francisco, andState of California, have invented certain new and useful Improvementsin Air-Admission Means for 3oiler-l urnaces.

The hereinafter described invention rclates to that class of refractorylined boiler furnaces wherein air is admitted for oxidizing thecombustible gases evolved from the fuel therein and completing theircombustion within the confines of the fire box.

()ne of the objects of the invention is to effect economy in fuelconsumption by controlling the air admission into the the box combustionchamber in relation to the amount of fuel or combustible gases deliveredtherein by the simultaneous operation of the fuel feed and air admissionmeans.

Another object of the invention is to minimize the amount of excess airrequired for combustion purposes by simultaneous control of the fuel andair feed into the tire box combustion chamber.

An important object of the invention is its adaptation to refractorylined fire box combustion chambers wherein fuel oil is injected as aprotection against failure and leakage of the sheets, seams and tubes ofthe fire box caused by excess cold air being taken therein, as well asthe deterioration of the refractory lining through expansion andcontraction caused by excess chill air admitted into the combustionchamber through carelessness in not closing the independently operatedair damper doors now commonly used in connection therewith, suchprotection to the tire box and refractory lining being especiallynecessary in refractory lined locomotive fire box combustion chamberswhen locomotives are standing on sidings or in roundhouses with firesout.

In the accompanying drawings Figure 1 shows a broken side elevation of alocomotive boiler fire box combustion chamber provided withsimultaneously operated fuel,

feed valve and air admittance means into the combustion chamber inaccordance with -my invention. Fig. 2 is a rear end elevation showingattachment of fuel feed valve control to locomotive boiler head andoperative connection of front and rear air inlet damper thereto. Fig. 3is a broken plan section on line a 3, Fig. 2, showing means forsimultaneously operating the fuel feed valve in bearings, 10, is damperdoor, 11.

and the front and rear air inlet dampers into combustion chamber.

Referring to the drawings numeral 1 is used to designate a refractorylined locomotive tire box boiler and 2 the pan forming therewith thecombustion chamber 3. In the use of the invention fuel is injected intothe combustionchamber through a burner, 4, being controlled by a.regulating valve, Air openings leading into the combustion chamber, 3,are provided at the front and rearof the pan, through damper doorhousings, (i, and 7, respectively. Fitted to lront damper door housing,6, and mounted 1n bearings, 8, is damper door, 9,. and likewise fittedto rear damper door housing, 7, Proylded on front damper door, 9, ispivot hearing, 12, eccentric to bearings, 8, acting in relation theretoas a crank center, and likew se provided in rear damper door, 11. ispivot bearing, 13, eccentric to bearings, 10. Numeral l4 designates afuel feed valvc handleand 15 a quadrant in operative re lationtherewith, the quadrant being conveniently attached to the boiler headby bracket 16. Fastened to the handle.-l5. and depended therefrom isextension rod, 17, upon which are secured at its lower end the leverarms 18 and 19. Conmulnicatina with lever arm 18 in pivotal relationthere with is rod,'20, extending horizontally to the front end of pan,2, where it connects pivotally to one end of lever arm, 21. The oppositeend of lever arm, 21, is secured on transverse rod, 22, one end of whichrides in outboard bearing, 23, and the other end of which is fasteneddirectly to the fuel regulating valve, 5, thus completing theconnnunicating link necessary for operating the fuel regulating valve 5,by handle, 1.").

Numeral 2i designates a rod movably connected at one end to damper doorpivot bearing, 13, and at its opposite end pivots ally to lever arm, 19,rod, 24, furnishing' the con'ipletlng hnk for operating the rear damperdoor, ll,'simultaneous with the fuel regulating valve, 5, through themovement of operating handle, '14.

Numeral 25 designates a lever arm fixed at one end on transverse rod,22, and pivotally connected on its opposite end to one. end ofconnecting rod, 26. Rod, 26, has its opposite end movably connected todamper door pivot bearin 12, thereby furnishing the. link forsimultaneously operating-the front damper door, 9, with the fuel feedvalve, 5., by the movementof operating handle, 14.

may be of such length and so set that a rela-,

tively quick or slow opening of fuel feed *alve, 5, may be accomplishedsimultaneoiislywitli a given opening of the damper doors, Sand 11, andlikewise the crank centers or pivot bearings, 12 and 13,-of the frontand rear damper doors, respectively, may be changed to a shorter orlonger throw in their eccentric relation to damper door bearings, 8 and10, and consequently may be caused to open or close a relatively greaterdistance simultaneously with a given opening of the fuel feed valve, ittherefore being clear that the means for simultaneously operating thefuel feed valve and damper doors are adjustable to meet the conditionsunder which the boiler furnace may be drafted. Again should it bedesired to meet special conditions of service either the front or backdamper may be operated simultaneously with the opening or closing of thefuel feed valve, 5, by disconnecting either the f out 01' rearconnecting rods, 26 or 24 restectively. However, under normal operatingconditions both front. and rear damper doors are arranged so thatmaximum opening of fuel feed valve gives maximum opening of air inletthrough the damper doors into the combustion chamber and closing of thefuel feed valve closes the air inlet into the combustion chamber.

The operation of the invention is illustrated in the drawings by solidlines showing the simultaneous closing of fuel feed valve, 5, operatinghandle, 14, and front and rear damper doors, 9 and 11, and lrv dottedlines showing the simultaneous opennig of the fuel feed valve asindicated by operating handle at 145 with the frontand rear damper doorsopen in the posltion 9 and 11 It is obvious that many modifications of amanually operated fuel oil feed valve, op- 'GI'EIlJlVB connectionbetween the fuel Oll feed valve and dampers, whereby upon regulating theflow of fuel oil through the valve the dampers connected thereto aresimultaneously regulated and'a proportional admittance of fueloil andair into the fire box is effected.

JESSE C. MARTIN, J n.

\Vitnesses -T. D. GAHLICHS,

V. W. HEALEY.

